PHY 1331 Lecture 6: PHY 1331 Lecture : Tutorial- Forces
1 Nov 2018
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Forces:
In the absence of external force, the object moves with constant velocity.
Therefore zero can be 0. As viewed from internal reference frame. Inertial frame
of reference has no acceleration.
2nd law of dynamics
If there is an external force f acting on the body of mass, the body will accelerate
and the relation will be f=ma
3rd law or dynamics
If object A acts on object b with force fab, then object b acts on object a with the
force fBA such that fBA as a vector is equal to
Universal law of gravitation:
Equivalence principle tells you that it is impossible to distinguish between Mg
and Ma
Main types of forces encountered by struggling students:
Weight: w=mg
Tension:
Normal force: perpendicular to the support
When object is about to lift off the ground the normal corce is equal to zero.
Weight:
Tension:
Normal:
Friction:
Buoyancy:
Drag:
You have a toaster that you are applying a force to, by yanking on the cable at an
angle of 30 degrees( applied force) force will be applied until toaster lifts off
counter
Key to solving this question is in the phase about to loose contact with counter.
Monday, October 15, 2018
5:28 PM
Forces:
In the absence of external force, the object moves with constant velocity.
Therefore zero can be 0. As viewed from internal reference frame. Inertial frame
of reference has no acceleration.
2nd law of dynamics
If there is an external force f acting on the body of mass, the body will accelerate
and the relation will be f=ma
3rd law or dynamics
If object A acts on object b with force fab, then object b acts on object a with the
force fBA such that fBA as a vector is equal to
Universal law of gravitation:
Equivalence principle tells you that it is impossible to distinguish between Mg
and Ma
Main types of forces encountered by struggling students:
Weight: w=mg
Tension:
Normal force: perpendicular to the support
When object is about to lift off the ground the normal corce is equal to zero.
Weight:
Tension:
Normal:
Friction:
Buoyancy:
Drag:
You have a toaster that you are applying a force to, by yanking on the cable at an
angle of 30 degrees( applied force) force will be applied until toaster lifts off
counter
Key to solving this question is in the phase about to loose contact with counter.
Monday, October 15, 2018 5:28 PM
